存量前端：生图分组/灯箱/重生控件/导入文案/驳回横幅+SSE+总核销表

- ImageStrategyGroup/ImageLightbox/RegenControls/ImportTextModal/
  RejectReasonBanner 新建组件
- tasks images/text/new + history + 配置/布局/SSE hooks 存量改动
- 总核销表进度更新

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/AuthGuard.tsx

@@ -15,7 +15,8 @@ const ROUTE_ROLES: Record<string, UserRole[]> = {
   '/config': ['admin'],
   '/review': ['admin', 'supervisor'],
   '/history': ['admin', 'supervisor', 'operator'],
-  '/tasks/new': ['admin', 'operator'],
+  '/tasks/new': ['admin', 'supervisor', 'operator'],
+  '/fission': ['admin', 'supervisor', 'operator'],
   '/dashboard': ['admin', 'supervisor', 'operator'],
 };